Pipe mold for centrifugal casting machines



April 5, 1927.

C. E. WILDER PIPE MOLD FOR CENTRIFUGAL CASTING MACHINES File Nov- 1925 2 Sheets-Sheet 1 Aprll 5 1 E, WILDER PIPE MOLD FOR CENTRIFUGAL CASTING MACHINES Filed- Nov. 9, 19 2 Sheets-Sheet 2 trifugal castin chine, hav ng Patented Apr. 5, 1927.

1,623,146- PATENT OFFICE.

GJI'ION E. WILDEB, OI IRVINE, PENNSYLVANIA.

' m IOLD FOB CHTBIFUGAL CASTING MACHINES.

Application meaxovmber 9.1925. Serial Io. 67,849.

This invention relates to molds for cenmachines.

The object 0 this invention is to provide a pipe mold fora centrifugal casting ma such exterior form that the metal wall "thereof will be substantially uniform in thickness from. end to end, so that its cylindrical wall will be free to expand without checking on the interior surface thereof.

Heretofore pipe molds for centrifugal casting machines have been made from forgings having sufiicientmetal at each end from which the-sealing flange at one end and the driving flange at the opposite end are niachined.

These flanges being 7 removed from the source of heat, when the mold is in operation,

tively being machined, and are therefore 0 com-.

' becomes necessary to provide a new mold do not expand, and therefore cause the m terior surface of the mold to check at the end portions thereof. The present method.

of making the mold, requiring excess metal to-be machined therefrom also increases the ex nse of manufacture.

' n carrying out the object of my invention I make a forgin of the necessary diameter for a pipe mol tube, and I place in the intake endof the finished mold, a throat ring, and u n the exit end of the mold tube a drivin ange ring which throat ring and driving ange ring can be removed from the tube when desired. The throat ring, and drivin fiange ring, eacli being of comparalight weightare easily "handled while paratively cheap construction, and. w on it tube to replace one too much worn by use, the rings can be placed on the new tubes.

The features of my invention are'hereinafter fully described and pointed'out, and are illustrated in the accompanying drawings, in which:

Figure 1 is a side elevation of a pipe mold for a centrifugal casting machine-embodying my invention, 4 I E Fi ure 2 an enlarged view of the same showing the ends thereof in vertical central section, with the intermediate portion brokenaway. I

Figure 3 is a side elevation of my improved pipe mold tube with the throat and driving rings removed therefrom.

Figure 4 is an end view' looking into the exit end thereof, l

said driving ring Figure 6 is a central/vertical section of the same. 7 i i Figure 7 is an enlarged fragmentary view of a portion of the same. Figure 8 shows side and end elevations of the locking means for said ring. In these drawings A indicates a pipe moldtube. Around the intake end a of the tube A are annular slots (1' to form water seals when placed in a casting machine, not shown. The interior of the intake end a, of the tube A is provided with an annular shoulder A and with internal screw threads A,

see Fig. 2. v Inserted into the intake end a, ofthe tube A is a throat ring B, which is provided with external threads B which engage the internal threads A, and with an annular shoulder B which engages the end a of the tube A, and projects beyond the shoulder A on the tube A, thereby serving as an internal shoulder within the tube against which the molten metal engages. thereby forming the end of the pipe bein cast therein. The throat ring B is provi ed with recesses b around its exterior, which may be engagedby a spanner wrench to remove and replace the throat ring B upon the tube A. The bell-shaped exit end of the mold tube A is provided with a cylindrical surface 6, which is provided with internal threads 100 D which engage the threads 0 on the tube. The ring D is provided with an annular shoulder d on its left hand side, see Figs. 2, 5, 6 and 7, which embraces the exterior of the undercut flange C 'as shown in Fig. 2, 105 'said ring engaging the annular edge of said flange. The righthand side of the ring D is provided with an annular flangeE which engages the annular end of the tube, so that D will be firmly secured upon the bell shaped exit end of the tube A.

threads f, which coincide with the internal.

threads D of the ring D and engage the threads C on the mold tube A. The ring D is also provided with ascrew-threaded opening G on the axis of the recess F in which I place a screw G; see Fig. 2, which engages the block F and is adapted to force the segment of threads f against the threads C on the tube A, thereb'y frictionally holding the ring D from rotating on the threads C.

It will thus be seen that the forging for the mold tube A will therefore need not contain metal heretofore necessary for the seal and driving flanges at each end of the tube, which were heretofore necessary to be machined on a lathe large enough to carry the tube, but that the forging will only contain enough metal for the tube as shown in Fig. 3, the intake end a, being of the same diameter as the intermediate portion of the mold tube, and that the necessary radial flan e at the bell-shaped exit end of the mold tube can be made separately, and put in place after the tube is finished, thus elfecting a greatsavingin material and labor.

Having thus fully described my invention so that others can utilize the same, what I claim as new and desire to secure byiLetters Patent is: r

1. A pipe mold-tube the wall'of which is of substantially uniform thickness throughoutits entire length, and a driving ring removably secured around the exit end of said mold-tube.

2. A pipe mold tube having alt annular bearing-slot around the intake end thereof, internal screw threads Within theintake end of said tube, a throat ring, external screw threads t hereon adapted to engage said internal threads, external screw-threads on the opgosite end of said tube, a driving ring,

internal screw threads in said driving ring adapted to engage said external threads,

whereby said driving ring is removably secured on said mold tube. 3. A pipe mold tube having a bell-shaped exit end, an under cut flange around said exit end, axial slots through said undercut flange,

screw threads on said shoulder, a ring, internal screw threads therein, adapted to engage the threads onsaid shoulder, a recess in said ring, a block in said recess, segments of threads on said block adapted to engage the threads on'said shoulder, and a screw mounted,iu said ring adapted to engage said block, whereby the same may be forced transversely of the threads on said cylindrical SllOuldigl;

5. A pipe old consisting of a tubular shell of uniform thickness throughout its length, removable end rings therefor, and means to secure said rings in place on said shell. I

6. A pipemold-tube the wall of which is of substantially uniform thicknessthroughout/its entire length, a pair of spaced circun'iferential slots around the intake end of said tube, and a throat ringadapted to be inserted into said tube to a point opposite the second of said slots.

f In testimony whereof I affix my signature. CLINTON E. WILDER. 

